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Why is my craftsman snow blower running inconstantly and surging rpm ?

My craftsman snow blower model no. 247.886911 surges and struggles to maintain rpm. I started it for the first time this winter and it ran full throttle and was stuck there. I shut it off and restarted it a few minutes later and it then ran at the correct rpm but only for 15 seconds before surging. I drained the fuel system, cleaned the carburetor, replaced and gaped the spark plug, and filled with fresh gas. It starts great but begins to surge after 15 seconds every time. It also runs worse as i turn from choke to run position. I tried blowing a little snow with it and it ran at a more stable rpm under load. The service manual does indicate a cause of this may be over-governed engine. If i hold the arm on the governor in place it runs smooth. Does anyone have any solutions on how i can determine if it is still a carburetor issue or a governor issue?

Craftsman , Electric Snowblowers , Snow Removal Equipment
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by Manage My Life
January 12th, 2013
Answered in 2 minutes
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